Tag: applied chemistry

Questions Related to applied chemistry

Quantum dot is a___________.

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Nano particle

  2. Semi conductor

  3. A,B

  4. Insulator

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Correct Option: C
Explanation:

Quantum dot is a Semi conductor made up of Nano particles.Basically a single electron trapped inside a cage of atoms and when the dot is exposed to a pulse of light at the right time and wavelength, the electron is raised to an exited state. Thus when the electron fall back to its ground state, these dots then have the ability to glow. Quantum dots are a special class of materials known as semiconductor. Quantum dots are very special because they are so small that 4,000,000 dots take up 2 cm. Hence option C is correct.

Nano wires and Nano tubes are:

nanochemistry nanotechnology applied chemistry materials chemistry

  1. materials that are nanoscale in two dimensions

  2. materials that have one dimension in the nanoscale

  3. materials that are nanoscale in three dimensions

  4. all the above

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Correct Option: A
Explanation:

$\text{Nano wire and Nano tubes :}$

$\text{1.Measurment in nano scale.}$ 
$\text{2.Two dimensional.}$

The advantages of using nanoparticles as a drug delivery system include:

nanochemistry nanotechnology applied chemistry materials chemistry

  1. the size and surface characteristics of nanoparticles can be easily manipulated. This could be used for both passive and active drug targeting

  2. nanoparticles can be made to control and sustain release of the drug during the transportation as well as the location of the release. Since distribution and subsequent clearance of the drug from the body can be altered, an increase in drug therapeutic efficacy and reduction in side effects can be achieved.

  3. choosing an appropriate matrix also helps in increasing the efficacy and reducing side effects

  4. all of the above

Show answer
Correct Option: D
Explanation:
  • The size and surface characteristics of nanoparticles can be easily
    manipulated. This could be used for both passive and active drug
    targeting
  • Nanoparticles can be made to control and sustain release of the drug during the transportation as well as the location of the release.
    Since distribution and subsequent clearance of the drug from the body can be altered, an increase in drug therapeutic efficacy and reduction in side effects can be achieved.
  • Choosing an appropriate matrix also helps in increasing the efficacy and reducing side effects
  • Targeted drugs may be developed
  • Various routes of administration including oral, nasal, injection, intra-ocular (within the eyes) etc. can be used.
  • Hence option D is correct.

Increased relative surface area, and quantum effects of nano particles increase the which of the following properties :

nanochemistry nanotechnology applied chemistry materials chemistry

  1. reactivity of the Nano particles

  2. strength of the Nano particles

  3. electrical characteristics of the Nano particles

  4. All the above

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Correct Option: D
Explanation:

Two principal factors cause the properties of nanomaterials to differ  significantly from other materials: increased relative surface area, and
quantum effects. These factors can change or enhance properties such as
reactivity, strength and electrical characteristics.
Increased relative surface area, and quantum effects of nano particles increases the :

reactivity of the Nano particles, strength of the Nano particles, electrical characteristics of the Nano particles.
Hence option D  is correct.

Materials which  have one dimension in the nanoscale (and are extended in the other two dimensions) are:

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Graphene

  2. Thin films

  3. Surface coatings

  4. All of the above

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Correct Option: D
Explanation:

All are having one dimension and can extend up to other two dimensions also.

What are the dimensions of nanomaterials?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Between 1 nm and 100 nm

  2. Between 100 nm and 10000 nm

  3. Between 0.01 nm and 1 nm

  4. Between 1 $\mu$m and 100 $\mu$m

Show answer
Correct Option: A
Explanation:

Nanomaterials have atleast one dimension between 1 nm and 100 nm.

Which of the following are applications of Nano particles?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Targeted drugs may be developed

  2. Various routes of administration including oral, nasal, injection, intra-ocular (within the eyes) etc. can be used.

  3. The size and surface characteristics of nanoparticles can be easily manipulated. This could be used for both passive and active drug targeting

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • The size and surface characteristics of nanoparticles can be easily
    manipulated. This could be used for both passive and active drug targeting
  • Nanoparticles can be made to control and sustain release of the drug during the transportation as well as the location of the release.
    Since distribution and subsequent clearance of the drug from the body
    can be altered, an increase in drug therapeutic efficacy and reduction in side effects can be achieved.
  • Choosing an appropriate matrix also helps in increasing the efficacy and reducing side effects
  • Targeted drugs may be developed
  • Various routes of administration including oral, nasal, injection, intra-ocular (within the eyes) etc. can be used.
  • Hence option D is correct.

Carbon nano tubes are made up of:

nanochemistry nanotechnology applied chemistry materials chemistry

  1. carbon nano particle

  2. carbon atoms

  3. compounds containing carbon atoms

  4. none of the above

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Correct Option: A,B
Explanation:

Carbon nano tubes are made up of carbon nano particles. Example: Fullerene is the allotrope of carbon. It is also a nanomaterial. The cylindrical fullerene is called as carbon nano tube. 

Which of the following are production  methods of nanomaterials?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Top-Down method

  2. Bottom-Up method

  3. Down-Top method

  4. A,B only

Show answer
Correct Option: D
Explanation:

Nanomaterials are not simply another step in the miniaturization of  materials or particles. They often require very different production approaches. There are several processes to create various sizes of nanomaterials, classified as top-down and bottom-up. Although large numbers of nanomaterials are currently at the laboratory stage of manufacture, many of them already are being commercialized. Hence option D is correct.

The size of a nano particle is ____________ of a typical bacterium.

nanochemistry nanotechnology applied chemistry materials chemistry

  1. 10 times that

  2. 1000 times

  3. 1/100th

  4. one millionth

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Correct Option: C
Explanation:

The size of a nanoparticle is  about 50000 times smaller than the diameter of a single strand of human hair and 1/100th of a typical bacterium.